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From: Mauro Orlandini <orlandini@tesre.bo.cnr.it>
Newsgroups: comp.text.tex
Subject: Re: Amsmath problem
Date: Tue, 25 Jun 2024 06:41:38 -0000 (UTC)
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Il Sun, 23 Jun 2024 14:49:17 -0000 (UTC), db ha scritto:

> \maketitle Bla bla $\mathrm{AuCl_4^−}$ and $\mathrm{TOA^+}$

The problems comes from the minus sign on the first chemical formula. You 
did not use the keyboard minus sign but the slash symbol.

Your minus sign: −
Keyboard minus sign: -

If you substitute it, then it will work.

Ciao, Mauro